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Subtract 42/12 from 1/21

1st number: 1/21, 2nd number: 3 6/12

1/21 - 42/12 is -145/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    42/12 = 42 × 7/12 × 7 = 294/84
  4. Subtract the two like fractions:
    4/84 - 294/84 = 4 - 294/84 = -290/84
  5. After reducing the fraction, the answer is -145/42

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